Storage medium comprising a security feature and method for producing a storage medium comprising a security feature

Abstract

The invention relates to a storage medium comprising a security feature, having a substrate ( 1, 4, 10 ), at least one functional layer ( 2, 5, 11 ), at least one feature which is written into the functional layer ( 2, 5, 11 ) and is visible when reflected and at least one feature which is written into the functional layer ( 2, 5, 11 ) and is visible when transmitted, at least one feature being individualized and at least one feature having a diffractive structure. The invention solves the technical problem of providing a larger variety of combinations of different security features. The invention also relates to a method for producing a storage medium comprising a security feature.

1. A storage medium comprising a security feature, comprising
 a substrate ( 1 , 4 , 10 ), 
 at least one functional layer ( 2 , 5 , 11 ), 
 at least one first feature written in the at least one functional layer ( 2 , 5 , 11 ) which is observable in reflection, 
 at least one second feature written in the at least one functional layer ( 2 , 5 , 11 ) which is observable in transmission, and 
 wherein at least the one first feature is individualized and wherein the at least one second feature has a diffractive structure. 
 
     
     
       2. The storage medium as claimed in  claim 1 ,
 wherein the at least one first feature and the at least one second feature are written as microstructurings in the functional layer ( 2 , 5 , 11 ). 
 
     
     
       3. The storage medium as claimed in  claim 1 ,
 wherein the at least one first feature and the at least one second feature are written alongside one another in the functional layer ( 2 , 5 , 11 ). 
 
     
     
       4. The storage medium as claimed in  claim 1 ,
 wherein the at least one first feature and the at least one second feature are written in at least partly overlapping fashion in the functional layer ( 2 , 5 , 11 ). 
 
     
     
       5. The storage medium as claimed in  claim 1 , wherein the at least one first feature is embodied as a relief structure in at least one reflective functional layer of the storage medium. 
     
     
       6. The storage medium as claimed in  claim 1 ,
 wherein the at least one first feature which is observable in reflection is embodied as a structure having a different optical density. 
 
     
     
       7. The storage medium as claimed in  claim 1 ,
 wherein the at least one first feature observable in reflection is a reflectively diffractive structure or a structure observable reflectively by means of brightness modulations. 
 
     
     
       8. The storage medium as claimed in  claim 7 ,
 wherein the reflectively diffractive structure is observable by means of different brightnesses modulation and/or colors. 
 
     
     
       9. The storage medium as claimed in  claim 7 ,
 wherein the reflectively diffractive structure is a micro-image, in particular a metallically lustrous micro-image. 
 
     
     
       10. The storage medium as claimed in  claim 1 ,
 wherein the at least one feature which is observable in reflection is embodied as a reflectively diffractive information content or information content that can be observed reflectively by means of brightness modulations. 
 
     
     
       11. The storage medium as claimed in  claim 10 ,
 wherein the reflectively diffractive information content is a computer-generated hologram. 
 
     
     
       12. The storage medium as claimed in  claim 10 ,
 wherein the information content observable reflectively by means of brightness modulations is one of a micro-script, a micro-image or a barcode. 
 
     
     
       13. The storage medium as claimed in  claim 1 ,
 wherein the at least one feature observable in transmission is embodied as a structure having a different optical density, in particular as an at least partly perforated reflective functional layer. 
 
     
     
       14. The storage medium as claimed in  claim 1 ,
 wherein the at least one first feature which is observable in transmission is embodied as a transmissively diffractive structure or structure that can be observed transmissively by means of brightness modulators. 
 
     
     
       15. The storage medium as claimed in  claim 14 ,
 wherein the transmissively diffractive structure is a diffraction pattern. 
 
     
     
       16. The storage medium as claimed in  claim 14 ,
 wherein the transmissively diffractive structure is observable by means of brightness modulations with a micro-image, in particular a gray-scale image. 
 
     
     
       17. The storage medium as claimed in  claim 1 ,
 wherein the at least one feature observable in transmission is embodied as a transmissively diffractive information content or information content that can be observed transmissively by means of brightness modulations. 
 
     
     
       18. The storage medium as claimed in  claim 17 ,
 wherein the transmissively diffractive information content is a computer-generated hologram. 
 
     
     
       19. The storage medium as claimed in  claim 17 ,
 wherein the information content that can be observed transmissively by means of brightness modulations is a micro-script or a barcode, in particular in the form of a gray-scale image. 
 
     
     
       20. The storage medium as claimed in  claim 1 ,
 wherein at least one first features is a level-one security feature, and the at least one second feature is a level-two or level-three security feature. 
 
     
     
       21. A method for producing a storage medium comprising a security feature as claimed in  claim 1 , comprising the steps of
 providing at least one first feature observable in reflection which is written in at least one functional layer of the storage medium, 
 providing at least one second feature observable in transmission which is written in the at least one functional layer of the storage medium, 
 wherein at the at least one first feature is individualized, and 
 wherein the at least one second feature is written as a diffractive structure. 
 
     
     
       22. The method as claimed in  claim 21 , wherein the at least one first feature and the at least one second feature are written as micro-structuring into the functional layer. 
     
     
       23. The method as claimed in  claim 21 , wherein the at least one first feature and the at least one second feature are written alongside one another in the functional layer. 
     
     
       24. The method as claimed in  claim 21 , wherein the at least one first feature and the at least one second feature are written in at least partly overlapping fashion in the functional layer. 
     
     
       25. The method as claimed in  claim 21 , wherein the at least one first feature and the at least one second feature are written into the functional layer by means of a lithographic process. 
     
     
       26. The method as claimed in  claim 25 , wherein, by altering at least one process parameter pulse duration of the laser pulses, energy of the laser pulses, number of laser pulses per structure to be written and temporal laser pulse separation, differently effective structures (Type1a, Type1b, Type2, Type 3) are written into the at least one functional layer. 
     
     
       27. The storage medium as claimed in  claim 6 ,
 wherein the at least one first feature which is observable in reflection is embodied as an at least partly perforated reflective functional layer. 
 
     
     
       28. The storage medium as claimed in  claim 7 ,
 wherein the micro-image is a metallically lustrous micro-image. 
 
     
     
       29. The storage medium as claimed in  claim 7 ,
 wherein the at least one feature observable in transmission is embodied as a structure having a different optical density, in particular as an at least partly perforated reflective functional layer. 
 
     
     
       30. The storage medium as claimed in  claim 16 ,
 wherein the micro-image is a gray-scale image.